三角形腔体内纳米流体自然对流换热数值研究  

Study on Natural Convection Heat Exchange Value of Nano-Fluid in Triangular Cavity

作　　者：马文强[1] 马兵善[1] 王刚[1] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《甘肃科学学报》2016年第1期1-5,共5页Journal of Gansu Sciences

基　　金：国家自然科学基金项目(51266006);国家科技支撑计划项目(2011BAJ03B08);兰州理工大学博士基金项目(BS04200903)

摘　　要：采用有限容积法对二维三角形腔体内CuO-机油纳米流体自然对流换热进行了数值模拟研究,重点分析研究了液体纳米层厚度对CuO-机油纳米流体自然对流换热的影响,同时也研究了瑞利数Ra、纳米颗粒体积分数φ以及腔体高宽比AR对CuO-机油纳米流体自然对流换热的影响。研究结果表明,液体纳米层的存在使纳米流体的自然对流增强,换热量增大;在相同纳米颗粒体积分数下,随着Ra数的增大,自然对流换热强度显著增强,且Ra数较小时,换热量随着腔体高宽比AR的增大而减小。Numerical simulation research was implemented for the natural convection heat exchange of the CuO-engine oil nano-fluid in the two-dimensional triangular cavity by using the finite volume method,and the influence of the thickness of the fluid nanolayer to the natural convection heat exchange of the CuO-engine oil nano-fluid was analyzed and researched intensively,as well as the influence of Rayleigh number Ra,nano-particle volume fractionφand ratio ARof height to width of the cavity to the natural convection heat exchange of the CuO-engine oil nano-fluid.The research result showed that the natural convection of the nano-fluid should be strengthened and the amount of heat exchange should be increased in presence of fluid nanolayer;the natural convection heat exchange strength might be strengthened obviously along increasing Ra on the premise of identical nano-particle volume fraction;and the amount of heat exchange might be reduced along increasing ratio ARof height to width of the cavity when the Ra was small.

关 键 词：纳米流体 自然对流换热 三角形腔体 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]